Double-storey extension drawings in Enfield from £905
Southgate, Palmers Green, Winchmore Hill and Enfield Town: a bedroom above the kitchen is judged by a steeper 30 degree line, not the usual 45.
£905 £755 drawings + £150 survey (£905 total), no VAT to add
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The short answer
Enfield’s adopted policy DMD 11 says a first-floor rear extension must not cross a line taken at 30 degrees from the mid-point of the nearest original first-floor window of any adjacent property, and where appropriate must secure a common alignment of rear extensions. The ground floor below follows the single-storey tests. All distances run from the original dwelling. Our fee is £755 drawings + £150 survey (£905 total), no VAT to add; the council’s fee is separate.
Double-storey extension drawings
from £905
- Drawings
- £755
- Measured survey
- £150
- Total you pay
- £905
- VAT
- None to add
- A measured survey of both floors at the back and the neighbours’ original first-floor windows
- The 30 degree line from the middle of each nearest original first-floor window, drawn on the plan
- The ground floor tested against the 3 or 4 metre and 45 degree single-storey rules
- A check of your address against Enfield’s 22 conservation areas and any Article 4 direction
- Plans to Enfield’s list, and the route that fits submitted for you
£755 drawings + £150 survey (£905 total). A starting fee: we confirm one fixed figure after checking your address. The council’s own fee, where there is one, is paid to the council.
Get my fixed feeHow an Enfield double-storey extension runs
Original dwelling
We establish the original house, since DMD 11 measures from it whatever neighbours have built.
Survey
We measure both floors and the neighbours’ original first-floor windows.
Design
You choose the layout, with the 30 degree line and the route written down.
Draw and submit
We prepare the pack to Enfield’s list and submit it.
The 30 degree line
Clause 3 of DMD 11 sets two tests for first-floor extensions. They must not exceed a line taken at 30 degrees from the mid-point of the nearest original first-floor window to any adjacent property, and, where appropriate, must secure a common alignment of rear extensions. The single-storey tests are 3 or 4 metres and the 45 degree line, so the upper floor is held back more tightly than the floor beneath it.
A 30 degree line is shallower, so it cuts in sooner. For example, if a neighbour’s first-floor window sits 2.5 metres from the boundary, the line allows far less depth upstairs than the 45 degree line would allow downstairs.
Original dwelling, not neighbours, and the planning route
The justification text says where neighbours have extended, the criteria still apply from the original dwelling regardless of the depth of the adjoining extensions, and that a greater depth may be allowed only to secure a common alignment. Enfield’s adopted-plans page lists DMD 2014 as current. Permitted development allows more than one storey only up to 3 metres and not within 7 metres of the rear boundary, so most of these are householder applications.
Enfield has 22 conservation areas and several Article 4 directions, and Green Belt land needs a statement about openness, so we check your address first.
Validation and CIL
Enfield aims to validate a correct application within 5 working days, and an application not put right within 21 days of a missing-information email is withdrawn as invalid, with an administration fee kept. The list also asks for roof plans and sections where a roof changes.
Enfield CIL runs at £40, £60 or £120 a square metre by zone, set in 2016, on 100 square metres or more of new floor space, so most double-storey extensions on a house are outside it. Mayoral CIL is in band 2.
Double-storey extensions in Enfield in numbers
851 of 920
Householder decisions by Enfield Council between July 2025 and June 2026 (prior approvals left out) that were made inside 8 weeks.
Source: MHCLG live table PS2, district planning application statistics, July 2025 to June 2026 (GOV.UK)
30°
Line from the mid-point of the nearest original first-floor window next door that a first-floor extension must not cross.
Common alignment
Where appropriate, a first-floor extension must secure a common alignment of rear extensions.
45°
Line from the nearest original ground-floor window that a single-storey extension must not cross, unless it secures a common alignment.
2014
Year the Development Management Document containing DMD 11 was adopted; the council still lists it as current.
Source: Adopted plans: Development Management Document 2014 and Core Strategy 2010 (Enfield Council)
22
Conservation areas in Enfield, some with Article 4 directions that withdraw permitted development rights.
5 working days
Time in which Enfield aims to validate an application that has the right documents.
Source: Local Validation Requirements, Householder Applications, 6 November 2023 (Enfield Council)
21 days
Time allowed to supply missing information before an invalid application is withdrawn and an administration fee kept.
Source: Local Validation Requirements, Householder Applications, 6 November 2023 (Enfield Council)
£120
Enfield CIL per square metre in the remainder of the borough; £60 in Enfield Town and the south, £40 in the eastern corridor (2016 rates).
Source: Community Infrastructure Levy Charging Schedule, adopted 1 April 2016 (Enfield Council)
£72.73
Mayoral CIL per square metre for permissions granted in 2026 in Enfield, which is in band 2 (£60 when set in 2019). It applies only where CIL is due at all.
Source: Mayoral CIL: Annual CIL Rate Summary 2026 (London.gov.uk)
Questions about double-storey extensions in Enfield
What is the 30 degree rule?
From the mid-point of the neighbour’s nearest original first-floor window, a line at 30 degrees marks how far your upper floor can reach.
Does my neighbour’s upper extension help?
Not directly. The criteria run from the original dwelling, though a common alignment can justify a greater depth.
Can the ground floor go deeper than the floor above?
Yes. The ground floor follows the single-storey limits of 3 or 4 metres and the 45 degree line.
Do I pay CIL on a double-storey extension?
Not normally. It applies from 100 square metres of new floor space.
See what your Enfield house can take upstairs
Send the address and a photo of the back. We reply with the route and a fixed fee, from £755 drawings + £150 survey (£905 total).